Add enhanced configuration templates for adaptive I/O features

- Introduced a comprehensive configuration template (config-adaptive.toml) for adaptive I/O, enabling improved upload/download dual stack with various performance optimizations, security settings, and network resilience features.
- Created a test configuration template (test-config.toml) mirroring the adaptive configuration for testing purposes.
- Added a simple test configuration (test-simple-config.toml) for basic adaptive features testing with essential parameters.
- Included an empty Jupyter notebook (xep0363_analysis.ipynb) for future analysis related to XEP-0363.

test-simple-config.toml

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+# Simple test configuration for adaptive features testing
+[server]
+listen_address = "8080"
+storage_path = "/tmp/uploads"
+metrics_enabled = true
+metrics_path = "/metrics"
+max_upload_size = "10GB"
+max_header_bytes = 1048576
+deduplication_enabled = false
+file_naming = "original"
+networkevents = true
+precaching = true
+
+[uploads]
+allowed_extensions = [".jpg", ".jpeg", ".png", ".gif", ".mp4", ".mov", ".avi", ".pdf", ".doc", ".docx", ".txt"]
+chunked_uploads_enabled = true
+chunk_size = "2MB"
+resumable_uploads_enabled = true
+sessiontimeout = "1h"
+maxretries = 3
+
+[downloads]
+allowed_extensions = [".jpg", ".jpeg", ".png", ".gif", ".mp4", ".mov", ".avi", ".pdf", ".doc", ".docx", ".txt"]
+chunk_size = "2MB"
+cache_enabled = true
+cache_max_size = "500MB"
+cache_max_age = "24h"
+
+[security]
+hmac_algorithm = "SHA256"
+secret = "test-secret-key-for-adaptive-testing"
+max_concurrent_uploads = 10
+max_concurrent_downloads = 20
+
+[logging]
+level = "INFO"
+format = "json"
+output = "console"